/*
 * Copyright 2024 LinQingYing. and contributors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * The use of this source code is governed by the Apache License 2.0,
 * which allows users to freely use, modify, and distribute the code,
 * provided they adhere to the terms of the license.
 *
 * The software is provided "as-is", and the authors are not responsible for
 * any damages or issues arising from its use.
 *
 */

package com.linqingying.cangjie.resolve.calls.components

import com.linqingying.cangjie.builtins.CangJieBuiltIns
import com.linqingying.cangjie.config.LanguageFeature
import com.linqingying.cangjie.descriptors.ModuleDescriptor
import com.linqingying.cangjie.resolve.calls.components.candidate.ResolutionCandidate
import com.linqingying.cangjie.resolve.calls.inference.components.ConstraintInjector
import com.linqingying.cangjie.resolve.calls.model.CangJieCallArgument
import com.linqingying.cangjie.resolve.calls.results.*
import com.linqingying.cangjie.types.checker.CangJieTypeRefiner
import com.linqingying.cangjie.utils.CancellationChecker
import java.util.HashMap
import com.linqingying.cangjie.resolve.calls.model.ResolvedCallArgument
class NewOverloadingConflictResolver(
    builtIns: CangJieBuiltIns,
    module: ModuleDescriptor,
    specificityComparator: TypeSpecificityComparator,
    platformOverloadsSpecificityComparator: PlatformOverloadsSpecificityComparator,
    cancellationChecker: CancellationChecker,
    statelessCallbacks: CangJieResolutionStatelessCallbacks,
    constraintInjector: ConstraintInjector,
    cangjieTypeRefiner: CangJieTypeRefiner,
) : OverloadingConflictResolver<ResolutionCandidate>(
    builtIns,
    module,
    specificityComparator,
    platformOverloadsSpecificityComparator,
    cancellationChecker,
    {
        // todo investigate
        it.resolvedCall.candidateDescriptor
    },
    { statelessCallbacks.createConstraintSystemForOverloadResolution(constraintInjector, builtIns) },
    Companion::createFlatSignature,
    { it.variableCandidateIfInvoke },
    { statelessCallbacks.isDescriptorFromSource(it) },
    { it.resolvedCall.hasSamConversion },
    cangjieTypeRefiner,
){

    companion object {
        private fun createFlatSignature(candidate: ResolutionCandidate): FlatSignature<ResolutionCandidate> {
            val resolvedCall = candidate.resolvedCall
            val isEliminationAmbiguitiesWithExternalTypeParametersEnabled =
                candidate.callComponents.languageVersionSettings.supportsFeature(LanguageFeature.EliminateAmbiguitiesWithExternalTypeParameters)
            val isEliminationAmbiguitiesOnInheritedSamInterfacesEnabled =
                candidate.callComponents.languageVersionSettings.supportsFeature(LanguageFeature.EliminateAmbiguitiesOnInheritedSamInterfaces)
            val descriptor = if (isEliminationAmbiguitiesWithExternalTypeParametersEnabled) {
                resolvedCall.candidateDescriptor
            } else {
                resolvedCall.candidateDescriptor.original
            }
            val valueParameters = descriptor.valueParameters

            var numDefaults = 0
            val valueArgumentToParameterType = HashMap<CangJieCallArgument, TypeWithConversion>()
            for ((valueParameter, resolvedValueArgument) in resolvedCall.argumentMappingByOriginal) {
                if (resolvedValueArgument is ResolvedCallArgument.DefaultArgument) {
                    numDefaults++
                } else {
                    val originalValueParameter = valueParameters[valueParameter.index]
                    for (valueArgument in resolvedValueArgument.arguments) {
                        val originalType = candidate.resolvedCall.argumentsWithConversion[valueArgument]?.originalParameterType
                        val resultType = candidate.resolvedCall.argumentsWithConversion[valueArgument]?.convertedTypeByOriginParameter
                            ?: valueArgument.getExpectedType(originalValueParameter, candidate.callComponents.languageVersionSettings)
                        valueArgumentToParameterType[valueArgument] = TypeWithConversion(
                            resultType,
                            if (isEliminationAmbiguitiesOnInheritedSamInterfacesEnabled) originalType else null
                        )
                    }
                }
            }

            return FlatSignature.create(
                candidate,
                descriptor,
                numDefaults,
                parameterTypes = resolvedCall.atom.argumentsInParenthesis.map { valueArgumentToParameterType[it] } +
                        listOfNotNull(resolvedCall.atom.externalArgument?.let { valueArgumentToParameterType[it] })
            )

        }
    }
}
